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COMBINED TYPEWRITING AND COMPUTING MACHINE Filed Oct. 25, 1933 6 Sheets-Sheet INVENTOB'. 1

April 2, 1940- J. TOGGENBURGER -2.195.606

COMBINED TYPEWRITING AND COMPUTING MACHINE Filed Oct. 25 1933 6 Sheets-Sheet 2 p 1940 J. TOGGENBURGER 2, 06

COMBINED TYPEWRITING AND COMPUTING MACHINE Filed Oct. 25, 1933 6 Shees-Sheet 5 INVENTOR:

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P 2, 1940- J. TOGGENBURGER 2.195.606

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COIBINED TYPB'RITING AND COIPUTING CHINE Filed Oct. 25, 1933 .6 Sheets-Sheet 5 P 1940- J. TOGGEN BURGER 2,195,606

COIBINED TYPE'RITING AND COMPUTING MACHINE 7 Filed Oct. 25, 1933 6 Sheets-Sheet 5 mm mm UNITED STATES PATENT OFFICE COMBINED TYPEWBITING AND COMPUTING MACHINE John Toggenbnrgcr, Bogota, N. 1., assignor to Underwood Elliott Fisher Company, New York, N. Y., a corporation of Delaware Application mmzs, 193:, Serial No. 695,081

6 Claims. (01. ass-so) In the Thieme application 680,036 flied July predetermined selection of cross-adders for said 12, 1933, a traveling platen-carriage of a stazone is made through some of said circuits pretionary typewriter carries vertical totalizers past paratory to performing accounting steps which a master-wheel driven by indexing trains which may be supplemental to the accounting done on include the typewriter-numeral-keys, and. bethe master-wheel-driven vertical totalizer of the 5 low the stationary typewriter, cross-adders andtyping unit. Others of said circuits come into individual groups of indexable drivers therefor play to effect selection, in denominational order, are. spaced crosswise of the machine, and any of the drivers of each selected cross-adder as indexing train may directly index, under dethe typewriter traverses the computing zone upon 10 nomination-selecting and cross-adder-selecting operation of the numeral-typing keys, which by 1 control of the same traveling platen-carriage, any means of still other circuits for actuating digitgroup or any combination of groups of drivers pin-setting members, index the proper crossfor said cross-adders which perform cross-addadder drivers, each of which has a complement ing extensively permutable with the vertical-addof digit-pins, by reason of such crossadder and ing operations; the cross-adders being cycled denomination selections. 15

after the indexing operations. At the end of a computing zone, another cir- One of the aims of this invention is to provide cult may be employed to'trip cycling mechanism an organization whereby machines of the Elliottassociated with the general operator, and there- Fisher (traveling keyboard) class may perform by cause the drivers to transfer their indexed vertical-adding and cross-addingof the same exvalues to the selected cross-adders. 20 tensive scope as is achieved by Thieme. Other circuits control the printing of a clear The position of the Elliott-Fisher traveling sign, to the end that such sign may be printed typing mechanism, with reference to any comfor any cross-adder only when the latter is puting zone of the underlying stationary platen, cleared.

must differentially determine for the zone the By meansof a state-controlling circuit, a'se- 25 selection of one or more of the cross-adders; furlected cross-adder may be caused to accumulate ther, the numeral-keys of the traveling keyboard an amount subtractively. must, in conjunction with the letter-feeding The digit-pins for each cross-adder are normovements of said typing mechanism through the mally offset from alignment with the correzone, index, in denominational order, the group spending aforesaid type-key-operated digit-pin- 30 of drivers for each selected cross-adder; and setting members, so that denomination-selection mechanism must be provided for cycling the inmay be effected by slightly advancing one driver dexed drivers. of any group at a time to align its digit-pins with To solve these and other phases of the problem said digit-members. Cross-adder selection may with a minimum of change in theorg'anlzation of be a result of'the denomination-selection in that, 35 the Elliott-Fisher 'or similar traveling keyboard as has heretofore been usual, only the members machine, and with minimum complexity in the of a group of drivers for a selected cross-adder cross-adding organization, the invention preferare advanced denominationally to align their ably employs an auxiliary cross-adding unit pins with said type-key-operated digit-members,

40 which maybe stationarily mounted in proximity the drivers for the unselected cross-adder re- 40 to the book-typewriter, preferably at the side maining in normal position with their pins oilthereof on a common stand. Said unit may be set from, and therefore unsettable by, said digitalong the lines of the cross-adding portion of the members.

Thieme organization. In order that there need be but one set of de- 4 Connections designed to permit free movement nomination-selectingelectromagnets and circuits of the traveling Elliott-Fisher typewriting mechtherefor, capable of serving all the groups of anism, and to enable said traveling mechanism cross-adder drivers, it is contrived to combine to control the stationary cross-adder unit, are with such one set of magnets a set of denomipreferably in the form of flexible wires. national shafts extending crosswise of all the A novel organization of electromagnets and groups of drivers. The denomination-selecting 50 contact devices is complemented by said wires to electromagnets or solenoids, one for each deform selectively energizable circuits which opernomination, may be disposed so that their armaatively conjoin the traveling typewriter and the tures or plungers may operate their respective stationary cross-adder unit. Upon the entry of cross-shafts by simple connections.

5 the traveling typewriter into a computing zone, Associated with each group of indexable drivers 5 is a shifter which serves to bring a set of coupiers into and out of operative alignment with the group of drivers, there being one set of coupiers for each driver-group, and said couplers when in operative alignment with said drivers serving to couple the latter to corresponding denominational cross-shafts. Normally the indexable drivers and couplers are out of operative alignment, and the displacement of a shifter to align its drivers and couplers constitutes selec tion of the associated cross-adder, since the aforesaid denominational cross-shafts and denomination-selecting magnets will then be enabled to efiect denomination-selection for indexing of the drivers.

For electromagnetically-controlled cross-adder selection, there is provided for each shifter therefore an operating circuit, including a solenoid and the necessary contact devices. Certain features relating to the relative dispositions of each group of cross-adder drivers, the shifter, the couplers, and the denominational cross-shafts for all the drivers may be, for example, along the lines set forth in the co-pending application No. 472,610, of Pitman, filed August 2, 1930, it being contrived to operate the cross-shafts and crossadder-selecting shifters by electromagnets under control of the typing mechanism. Associated with the shifters are novel latches and circuitbreaking devices, whereby a cross-adder-selecting magnet, as soon as it has actuated its shifter, is relieved of maintaining the shifter in effective position while the typing mechanism is operated in a computing zone. The latches are arranged so that the shifters and circuit-breaking devices are restored upon cycling of the general operator.

Another feature of invention relates to controlling the cycle-tripping circuit, to the end that the general operator will not be cycled repeatedly under certain conditions.-

Since certain circuits such as those relating to cross-adder selection, denomination-selection, subtraction-setting and cycle-tripping are to be controlled, and in some cases variably controlled, with reference to the various computing zones traversed by the traveling typewriting mechanism, each of such circuits presents a contact, the several contacts being grouped for compactness in proximity to one another and traversing as a group, or being traversed by an array of circuit-selecting fingers as the typewriting mechanism traverses a computing zone.

I There is an individual array of such fingers for each zone, each array including one or more cross-adder-seiecting fingers and also including a finger acting as a denomination-selector. For automatic cycle-tripping, automatic subtractionsetting and other similar zone-controlled operations, corresponding other fingers may be included in the array for any zone.

In the illustrated machine, it is preferably the aforesaid group of contacts that moves with the traveling typewriting mechanism, the several arraysof fingers being non-traveling, or, in other words, being transversely stationary. Any array of fingers by engaging corresponding contacts at a computing zone renders the circuits selected thereby either immediately or potentially effective, depending, respectively, on the non-inclusion or inclusion of other normally open contact devices in any of the magnet-controlling circuits. All the fingers of an array are connected to one side of a current-supply line, and preferably by means of an additional finger, included in said array, which engages an additional contact in the aforesaid group, said additional contact being wired to said supply-line side.

The several fingers of any array may be embodied in a simple unit which may be variably located in accordance with the location of a computing zone traversed in the travel of the typing mechanism. Thus there will be one such finger-unit for each zone, and each unit may also include a tabulating stop, so that both the setting of such stop for a zone and the location of the appropriate array of fingers for said zone are accomplished simultaneously.

In order that certain magnets, such as the denomination-selecting magnets, may not be operated unnecessarily, as, for example, when the typing mechanism is moved through a computing zone otherwise than by operation of the numeral-typing keys, it is contrived to associate with each numeral-typing key, in addition to the contact device for closing the digit-indexing circuit, a normally open contact device which is closed to energize the denomination-selecting circuit in suitably timed precedence to the closing of the digit-indexing contact device in the operation of a, numeral-key. Thus, even though the several denomination-selecting circuits are relatively traversed by the denomination-selecting finger in any movement of the typing mechanism through a computing zone, they will not be energized except by operation of the numeraltyping keys.

Other features and advantages will hereinafter appear.

In the accompanying drawings:

Figure 1 is a perspective view of a book-typewriter of the Elliott-Fisher class, showing the arrangement therein of various electricallyoperating controls for the indexing and distributing of totalizing operations in auxiliary crosstotalizers.

Figure 2 is a perspective view of the computing unit embodying the cross-adders, and shows the electrically operated devices for controlling the same.

Figures 3 and 4 are respectively front elevation and bottom plan views of a novel contact block employed on the book-typewriter for variably controlling the operations of the cross-adder unit.

Figure 5 is a partly sectioned side view of the book-typewriter, the section showing the interior of the machine, to illustrate the circuit distributing and selecting means associated with operation of the cross-adder unit.

-Figure 6 is a sectional side elevation of the cross-adder unit, illustrating the electromagnetically'operated means employed for associating said unit with the book-typewriter.

Figure 7 includes a sectional side elevation of part of the cross-adder unit, and also a circuitdiagram to illustrate electromagnetic control of a subtraction-setter.

Figure 8 is a diagram, iliustrating'the operation of certain parts of the cross-adder unit as controlled by the contact devices of the book-typewriter to select a cross-adder.

Figure 9 is a diagram, illustrating how the depression of a numeral-key, in co-operation with the contact devices of the book-typewriter, actuates certain parts in the cross-adder unit, to index the digit-value in a driver for the selected cross-adder.

Figure 10 is a perspective view, illustrating how the cross-adder unit may be mounted with the co-operating book-typewriter on a common supporting stand.

Figure 11 is a circuit-diagram for the entire machine, the parts of said machine related to the various circuits being indicated diagrammatically.

A typewriting mechanism, such as the Elliott- Fisher which includes a stationary platen l5 and master-wheel-operated totalizer I6, is generally indicated in Figure 10 by the reference letter A,

and an auxiliary cross-adder mechanism is generally indicated by the reference letter B, said mechanisms being mounted upon a common supporting stand i1.

There are only shown such parts of the Elliott- !"isher mechanism, Figures 1 and 5, as are necessary for an understanding of the invention.

Tracks II at the sides of the stationary platen.

guide the typing instrumentalities in line-spacing direction. The typewriting mechanism, with the exception of said stationary platen, is mounted in a frame i6 having rollers 20 and 2| riding on said tracks II. A subordinate frame 22 movable transversely on cross-tracks 22 and 24, presented 25 by the frame It, mounts the type-actions and cer-' tain master-wheel mechanism for crosswise movement such as letter-feeding.

fin Figure 5, 25 represents the traveling keyboard of the typewriting mechanism, said key- 30, board including numeral-key levers 26 swingable about a fulcrum-rod 21 upon depression of numeral-keys 26 to drive numeral-type bars 20 toward the stationary platen l5, to print at a common printing point; the several type-bars 29 being arranged in the usual arcuate array. The usual connections from each'key-lever 26 to the corresponding type-bar 29 include links II, 22 and 32, and sub-levers 34 and 25 arranged as shown, restoration of the parts upon release of 40 the :iepressed key-lever being effected by springs At operation of any key-lever 26, a universal bar 26, Figure 5, actuates escapement-mechanism 4i, such for example as shown in Patent No. 1,203,519, to Foothorap, of October 31, 1916. Said escape ment-mechanism co-operates with a letter-feeding pinion 42 and rack 45, to advance the frame 22, which carries all the type-actions, in a letterfeeding step under the pull of a spring-motor i9. Rollers 44 on frame 22 engage the rail 22 to restrain said frame against fore-and-after displacement relative to the frame IS.

The totalizers l6 are locatable transversely of the frame l6, there being one of said totalizers i6 5 for each computing zone of the stationary platen II in which it is desired totalizing.

Any suitable master-wheel mechanism operable conjointly with operation of the numeral-type 50 keys." will serve to illustrate the invention, and

such mechanism, as for example that shown in Patent No. 1,576,960, to Foothorap, of March 16.

1926, is therefore represented diagrammatically.

Said master-wheel mechanism includes a master- 65 wheel 46 mounted by, and traveling transversely with, the frame 22, so as to engage numeralwheels 41 of any, vertical totalizcr l6 in denomito perform vertical national order. The master-wheel 46 is rotated according to the digit-value of any operated 70 numeral-key lever 26, which accordingly drives the master-wheel 46 through an individual train which includes a gear-sector 46, said sector receiving an angular master-wheel driving displacement according to said value. The key-lever 26 75 operates the sector 46 through linkage which m cludes levers 46 and 50 connected by a link 5i, the relative distances from the respective fulcrums of said levers 49 and 50, at which the link 5| is connected, determining the angular displacement of the sector 46 as effected through a link 52 which connects said key-lever 26 to the lever 56. 45 represents a reversible connection, for subtraction, between the master-wheel 46 and a sector-driven shaft 41'.

Denominational'tabulating stops 54, mounted in the crosswise movable frame 22, are operated selectively by corresponding tabulating keys 56,

Figure 10,also mounted in said frame 22,toproject any stop 54 rearwardly into the path of a counter-stop 56, settable along a removable notched bar 51 presented by the main frame l9. Connections between the tabulating keys 55 and stops 54 and related carriage-release mechanism may be of any suitable form, as, for example, the connections shown in Patent 1,280,697, to Foothorap, of October 8, 1918.

Description of the mechanism of the crossadder unit B which is to be operatively conjoined with the typewriting mechanism A will be introduced in such part now as will prepare for understanding of the means to be described later for conjoining said mechanisms A and B.

Referring to Figures 2 and 6, each of the plurality of sets of cross-adder wheels has a corresponding group of drivers or rack-bars 6|, carrying each a set of digit-pins 62 individually depressible by an indexing operation, into the path of a general-operator cross-bar 62, which, when cycled after the indexing of an amount is completed, advances the indexed bars 6i to accumulate said amount in the wheels 60, as seen in the round-platen machine of the French Patent 726,799.

Extending transversely of the several groups of drivers 6| is a set of digit or pin-setting members 64. Each member 64 is part of a parallel-motion linkage 65, so that it may be moved up and down in parallelism. For actuating the digit-setting linkages 65 individually, there is a series of digit rock-shafts 66, each extending transversely of the linkages 65, as also set forth in said French patent.

To provide for complementary indexing for subtraction, an additional linkage 65' is provided and also an additional indexing digit-member 64'. Preparatory to subtractive indexing, the digitmember 64* is depressed to set all the 9" digitpins 62; and the rock-shafts 66 are shifted forwardly, so that, instead of actuating the pinsetting linkages 65 corresponding to the values of said rock-shafts as in addition, they will actuate the linkages of complementary value. The mechanism generally described so far with reference to subtraction-setting is along the lines of the computing mechanism set forth in Patent No. 1,280,065, to Minton, of September 24, 1918, said patent also illustrating the operation of linkages 65 for addition and subtraction and also the functions of parts similar to 64' and 65.

Briefly described, therefore, subtraction-setting of the indexing mechanism is effected by rocking a shaft 61, connected as seen in Figures 6 and 7, to move the digit rock-shafts 66 forwardly upon release of a subtraction-setter 69, connected to said rock-shaft 61 by an arm iii. A spring 1| constantly urges the subtraction-setter 69 rearwardly, the latter being normally restrained by a latch 12 keyed to a latch-withdrawing shaft 13 urged counterclockwise by a spring 14. Figure '7 indicates the latch 12 withdrawn so that the subtraction-setter 88 has escaped and thereby effected movement of the digit rock-shafts 68 and certain other parts to subtractive positions. I

Upon cycling of the general operator to advance the subtractively indexed drivers, the subtractionsetter 89 is restored and relatched, to thereby restore the indexing mechanism to its normal additive condition.

The cycling of the general operator 83 also effects restoration of whatever pins 82 were set, such restoration taking place during the return movement of the drivers as effected by the general operator, in its rearward movement, engaging a shoulder 'II of each driver. As the general operator 63 in its return movement brings the drivers with their pins 82 over a restoring plate 18, the latter is caused to be raised to restore the set pins. There may be an individual plate 18 for each group of drivers SI, the operation of the several plates by the general operator being substantially as set forth in Patent No. 1,382,286, to Hart, of June 21, 1921.

For the purpose of the invention, the digit rock-shafts 88 are actuated by electromagnets. Each rock-shaft therefore is connected to an armature or plunger 19 attractable by an electromagnet 80. The lower end of each plunger may be connected to an arm 8I of each rock-shaft. The plungers I8 may move along with the rockshafts 68 in accordance with the endwise shift of the latter for addition and subtraction setting. The upper end of each plunger may therefore be guided between studs 82 projecting from one of a pair of plates 88, in which the rockshafts are journaled and which form part of a frame for the pin-setting linkages 88. The several digit-indexing magnets or solenoids 80 may be mounted upon a platform 85 supported by the framework 88 of the cross-adder unit.

The conditioning of the indexing mechanism for subtraction is also to be under electromagnetic control, and, for this purpose, the computing unit B includes a subtraction-magnet 88 which-may be mounted upon a plate 88 at the rear of said unit B. The subtraction-magnet 88 upon being energized attracts allatch-member 80 rearwardly, to thereby release a spring-pressed lever BI loosely fulcrumed upon the aforesaid shaft I3 to which latter is fastened the latch I2 for the subtraction-setter 68. The released lever SI is enabled, through an abutting arm 92, fastened to said shaft I3, to rotate the latter for releasing the subtraction-setter 88. Upon the cycling of the general operator 83, the lever 8| is restored, thereby causing the latch 30, under the pull of a latch-spring 88, to re-engage said lever 8|. The lever 8I is. for that purpose, provided with an arm 88 which is cammed downward at the forward movement of the general operator 88.

The general operator may be cycled by a power-drive such as shown in said Hart patent and which is diagrammatically represented in Figure 6 by the showing of a reciprocatory member 81 connected to the general operator and connectible to an electric motor (not shown) upon raising of a clutch-pin 88 which is part of a clutch-mechanism represented by its casing 89. The cycle is tripped or initiated by raising said clutch-pin through linkage which may be similar to that shown in said Hart patent. Said linkage includes a spring-pressed lever IOI normally restrained by a latch I02 which may be withdrawn or tripped by a cycling magnet I03, also mounted on the plate 88. Upon the attraction of the latch I02 by the magnet III, the lever IOI, re-

leased to the pull of its spring I04, depresses a slide I08, which, through a cross-lever I08, withdraws the clutch-pin 88, whereupon the general operator 88 is cycled.

Figure 6 shows the normal positions of the drivers 6 I, and, in said normal positions, the digitpins 82 are not aligned with the digit-pin-setting members 88. Before a digit-pin-setting member 84 is operated by its magnet 80, the driver 8| in which a pin is to be set is therefore slightly ad vanced to align its pins with the digit-pin-settin members 84. In each group, the drivers 8| are advanced to pin-setting position, one after the other. I

Selection of any set of cross-adder wheels 80 is effected by determining that the corresponding group of drivers 8| shall be advanced in denominational order to pin-setting position. Such cross-adder selection and the advancing of the drivers 8| to pin-setting position are also to be controlled electromagnetically. In order that there need be but one set of denomination-selecting magnets capable of serving any or all of the several groups of drivers 6|, there is employed a set of denominational cross-shafts I08.

For each driver of the same denomination in the several groups, each cross-shaft has an arm I09 fastened thereto. For each cross-shaft I 08, there is also an operating solenoid or magnet I I I. The several magnets I I I, one for each denomination as indicated in Figure 2, by unit tens $1 unit, etc., are mounted on the plate 89. magnet III has an armature or plunger II2 having a forwardly extending link or stem II8 connected to an arm I ll of the corresponding crossshaft I08. The rear ends of the stems II8 may be slidably supported in a bar II5, which, as illustrated in Figure '7, forms a stop for limiting the forward movement of the armatures II2. Each train, including a cross-shaft I08, the several arms thereon, and the stem H3, is urged to normal position, determined by abutment of the armature I I2 with the bar H5, by a spring IIB.

In accordance with the explained method of selecting the set or sets of cross-adder wheels 80; namely, by indexing the drivers 8| for said set or sets, means are provided whereby the cross-shafts I08 may be selectively coupled to any group or groups of drivers 8|. Each driver-advancing arm I 09 of each cross-shaft I08 is accordingly provided with a coupler in the form of a forwardly reaching link I", the links III being grouped according to the grouping of the arms I09 for each driver-group, as will be seen in Figure 2. The forward ends of said links or couplers I I I are normally out of operative alignment with the drivers SI which said couplers are intended to operatively connect to the cross-shafts I08. For moving each group of couplers III into and out of operative alignment with the drivers 8|, the forward ends of said couplers II! are controlled by a bail or shifter 8. Figure 6 indicates the shifter III in such position that the couplers II1, that is, their forward ends, are out of operative alignment with the drivers 8|.

The shift of any coupler I I! to effective position, or, in other words, the selection of a set of cross-adder wheels, is also effected by electromagnetically operated means. There is accordingly associated with each shifter II8 a crossadder-selecting magnet I20. The several crossadder-selecting magnets may be also mounted on the rear plate 89, and may be interspersed, as indicated in Figure 2, with the denominationselecting magnets III. Associated with each Each cross-adder-selecting magnet I29 are an armature and forwardly-reaching stem III and I22. The forward end of each register-selecting stem I22 operates the corresponding shifter II3 through an upwardly-reaching arm I23 of the latter.

For a p rp se which will hereinafter appear, each cross-adder selector or shifter I I3 is latched when it has been moved to effective position, and, to this end, there is pivoted to the arm I23 01' each shifter a forwardly reaching latch I26, which, upon the movement of the shifter III to effective position, drops behind a catch afforded by the upper edge of a plate I26. which, as seen in Figure 6, also serves to guide the rear ends of the drivers 6|.

Other features of the auxiliary cross-adder unit B will be described in connection with the control of said unit B by the typewriting unit A.

It will be evident that as the typing mechanism, encompassed by the frame 22, travels of the stationary platen I6, several computing zones may be traversed. As the typing mechanism enters a computing zone, one or more of the cross-adders in unit B may be selected to accumulate the amount typed in said zone. The typing mechanism may be caused to enter a zone, as by operation of one of the tabulating keys 66 which serve to locate the typing mechanism at the proper denomination for typing the first figure oi an amount.

The appropriate cross-adders having been selected bythe entry of the typing mechanism into said zone, the typingof the amount figurev by figure and the corresponding indexing thereof in the drivers 6| of the selected cross-adders may begin immediately upon release of the operated tabulating key 65, the drivers 6| of each group associated with a selected cross-adder to be indexed in denominational order, according to the letter-feeding movements of the typing mechanism through the computing zone.

In order that the typing unit A may control the cross-adder-selecting magnets I20, the denomination determining magnets III and the digit-indexing magnets 60 of the auxiliary unit B, the typing unit 11 includes contact devices, some operative by the key-levers 26 and others operative by the crosswise movement of the typing mechanism, said contacts being supplemented by certain other contacts included in the cross-adder unit B, all the contacts co-operating in one way or another to complete circuits,

and thereby energize the several kinds of magnets for controlling the unit B. The portions of the circuits which extend between the mechanism A and the mechanism B are in the form of flexible wires compacted into a cable I21,

Figure 10, said cable being arranged to permit free movement of the typing mechanism, forwardly and rearwardly, and crosswise of the stationary platen I I.

Since operation of the circuits for the crossadder-selecting magnets, the denominationselecting magnets, the subtraction-setting magnet, and the cycle-tripping magnet, is related to the traverse of a computing zone by the typing mechanism, each of these last-mentioned circuits presents a contact for connection to one side of the power-line in accordance, as may be required, with the entry of the typing mechanism into a zone and its passage therethrough.

Referring to Figure 11, the circuit for each cross-adder-selecting magnet I20 presents a contact I29. These contacts I29 are coxetensive with a computing zone, so that, no matter to which denomination the typing mechanism is tabulated for a zone, co-operating fingers, to be described, will make contact with said contacts the power-line.

All the contacts I29 to I33, inclusive, may be incorporated in a unit or contact block I36 such as represented in detail in Figures 3 and 4, which will be described later. A bracket I36, Figure 5, mounts said contact block I36 so that it may move with the typing mechanism in frame 22 crosswise of the platen and in a path skirting the bar 51 on which the tabulating counterstops 66 are located, the several contact surfaces facing said bar.

Upon the entry of the typing mechanism into a computing zone, a stationary array of fingers- I31, which is located according to the computing zone, is engaged by specific ones of the contacts I29 to I33 as required for said zone. Thus, referring to Figure 8, in which it is assumed that the typing mechanism has been tabulated to the highest denomination of a computing zone and in which zone it is desired to effect subtraction and to select cross-adders I and 2 of the unit B, the array of fingers I31 for said zone includes a finger to be engaged by the subtraction contact I30, and two other fingers to be engaged by those contacts I29 related to the circuits for selecting registers I and 2.

In any array of fingers I31, there will invariably be included a finger for engaging the powerline contact I33, and a denomination-selecting finger for engaging the contacts I32. For automatic cycle-tripping, there would also be included a finger to engage the cycle contact I 3|.

Since it is usual to set a tabulating counterstop 56 for each computing zone, it is contrived to, at the same time, set an appropriate array of circuit-selecting fingers I31. Said fingers may be in the form of prongs projecting laterally from a plate I39 which may be secured to, but insulated from, the tabulating counterstop 56 which by its location on the bar 51 determines the zone location.

Upon the entrance of the typing mechanism into a computing zone, the cross-adder-selecting magnets I for said zone are immediately energized. Thus, referring to Figure 11, the energized circuit for selected cross-adder or register No. l, for example, would be through a lead I40 from one side of the power-line to the powerline contact I33 and the finger I31 in contact therewith, and by way of the finger-plate I39 to the contact I29 for register No. 1; thence by a lead I to the magnet I20 for cross-adder No. 1, and from the magnet, through a normally closed contact device I42, to a lead I43, which connects to the other side of the power-line or currentsupply source represented by a plug I44.

From the previous description of the crossadder unit B, it will be remembered that energization of a cross-adder-selecting magnet I20 causes the cross-adder-selecting shifter II9 to be raised and latched in effective position by means of the latch I which drops into effective and set the proper digit-pin 62.

position behind the plate I20. The normally closed contact device I42 may be operatively con-.

nected to the latch as shown so that upon the dropping of said latch to eifective position, said contact device I42 is opened, as indicated in Figures 8 and 9. This breaks the circuit of the corresponding register-selecting magnet, which, having done its work, need not remain energized during subsequent travel or the typing mecnanism through the computing zone.

Referring to Figure 8, it will be seen that although one of the denomination-selecting contacts I32 has engaged its finger I31, the driver or rack-bar 6| has not been advanced to bring its pins 62 under the pin-setting members 64. In other words, the denomination-selecting circuit is not completed by such engagement of contact I32 and its finger alone. This is for the purpose of avoiding actuating the denominationselecting magnets I I I by the mere passage of thetyping mechanism through a computing zone, that is, without accompanying operation of the numeral-key levers 26. There is associated therefore with the numeral-key levers 26 a contact mechanism, normally open, but which completes the circuit to the selected denomination selecting magnet, at the initial portion of the down stroke of any numeral-key lever 26.

To this end, there is preferably an individual pair of contacts I46 for each numeral-key lever 26 to effect such completion of the denominationselecting circuit. As indicated in Figure 5. a projection I41 on each numeral-key lever 25 keeps its contacts I46 open when the key-lever is in normal position, said contacts being, for this purpose, arranged as shown. The contact device I46 being closed and the driver SI of the appropriate denomination having been as a result thereby advanced to pin-setting position, before the numeral-key lever 26 reaches the end of its down stroke, the key-lever, in so reaching said end of the down stroke, may close another pair of con-' tacts I48 to energize the digit-selecting magnet related to the digit-setting member 64 of corresponding value, to thereby depress the latter Thus the contacts I46 also serve'to complete the denomination-selecting circuit in properly timed precedence to energization of a digit-selecting magnet 80 in order that advance of a pin-bar to indexing position may precede descent of a pin-setting member 64 upon operation of a typing lever 26.

Referring to Figure 9, the denomination-selecting circuit, as first partially closed by the denomination-selecting contact I32 and its finger I 01 and then completely closed by the key-levercontrolled contacts I46, may be traced as follows. From the power-line lead I40 to the power-line contact I33 and the finger I31 in contact therewith, and therefore through the finger-plate Ill, to the denominational contact I32; thence through the denominational selecting magnet II I, by way of. a lead I45, and from said magnet through another lead I50, to one of the now closed contacts I46, and by way of another lead I5I from the other of said contacts I46, to the other side I43 of the power-supply I44, said power-line side I43 being shown in Figure 9 as being tapped into said lead ISI.

The digit-indexing circuit energized at the bottom of the down stroke of any numeral-key lever 28, as in Figure 9, may be traced as follows. The power-line lead I43, I5I to the closed digit contacts I48, and thence by way of a lead I" to the corresponding digit-indexing magnet 80 and from the latter to the other side I40 of the power-line.

Upon release of the depressed numeral-key lever 26, the closed digit-indexing contacts I40 are first opened, and the pin-setting linkage 64, 65 and shaft 46 urged by the usual spring, not shown, are thereby, as a result, returned to normal position; the typing mechanism at about this time also escaping to the next denomination. whereat another key-operation and indexing of the next driver 0| may take place, it being noted that the contact I02 for said next denomination will have advanced into contact with the denomination-selecting finger I31 at such escape. As seen in the several diagrams, the denominationcontacts I32 may be spaced according to the punctuation-spaces obtaining on the work-sheet.

In case it is desired to have the selected registers compute subtractlvely in a computing zone, there will be included in the plate I39, which presents the array of fingers I31 for said zone, a finger to be engaged by the subtraction-setting contact III. Thus, upon the entry of the typing mechanism A into such zone, the subtraction-magnet ll of the cross-adder unit 13 will be immediately energized for the purpose of releasing the subtraction-setter 50, as indicated in Figure 7.

Referring to Figure 7, the subtraction-setting circuit may be traced as follows. From the power-line lead I40 to the power-line contact I33 and the finger I31 in contact therewith, and hence through the finger-plate I39, in which is included the subtraction-finger, to the subtraction-contact I30. From the subtraction-contact a lead I05 goes to the subtraction-magnet 00. From the subtractiommagnet another lead I56 goes to one of a pair of normally closed contacts I51, a lead I50, I" from the other of said contacts going back to the other side 0! the power-line. The pair of contacts I01 serve to break the just described subtraction-magnet circuit after the subtraction-magnet 00 has done its work in releasing the lever 9| by attracting the latch 90 which carries an armature 90-. As indicated in Figure 1, said contacts I01 are arranged relatively to said lever 9|, so as to be opened upon the release of the latter, and may therefore be operatively connected to said lever M as shown. When the general operator 00 is cycled, the resulting restora tion and relatching of the lever 9| will obviously permit the contacts I01 to be closed again.

Upon typing the last digit of an amount, the typing mechanism contained in the frame 22 takes the usual letter-feeding step. and the general operator 3 of the unit B may then be cycled to accumulate the amounts indexed in the drivers 0| of the selected cross-adders in said unit B. The cycling mechanism of the unit B may be tripped by energizing the cycling magnet I03, and such energization may be accomplished automatically by including in the array or fingers I31 presented by the finger-plate I30 a finger to be engaged by the cycling contact Ill.

It may be observed in Figure 11 that said cycling contact Ill is so located as to engage its finger I01 when the typing mechanism has taken the aforesaid letter-feeding step occurring upon the typing of the last digit. The cycling magnet I 00 will thereby be energized to attract the latch I02, which carries an armature I02, and thereby trip the cycling mechanism as previously described. Referring to Figure 7, the cycle-tripping circuit may be traced as follows. Through the power-line lead I48 and contact I33 to the finger-plate I33, which includes the indicated cycling finger I31, and from said finger, assuming the same to be engaged by'the cycling contact I3I, through said contact and a lead I60 therefrom to the cycling magnet I03. From the cycling magnet a lead I6I goes to one of a pair of normally open contacts I62, said contacts, however, being closed, as will presently be described, before the typing mechanism hasreached the end of a computing zone. Through the closed contacts I62, the circuit continues by way of-the lead I63 to the other side of. the power-supply line.

The contacts I62 are employed in the cycletripping circuit for the purpose of preventing repetition of a cycle should the typing mechanism A be halted with the cycling contact I3I in engagement with its finger. To this end, there extends crosswise of the arms I23 of the several cross-adder-selecting shifters II8 a contact-controlling rock-shaft I65, said shaft also reaching to an arm I66 of the releasable subtraction-lever 3|. Said rock-shaft I65 has fastened thereto arms I61, one for each of the arms I23 and I66, so that any one of said arms may rock the shaft I65 to close the cycle-circuit contacts I62 by means of an arm I68 also fastened to said rockshaft I65. Upon the cycling of the general operator 63 which results from energization of the cycling magnet I03, the subtraction-lever 3! is restored and relatched as previously explained, and the operated shifters II8 urged by the springs II6 are also restored by reason of the shifter-latches I25 being lifted from the plate I26 behind which they dropped, each latch having an extension I12 in the path of the general operator'63 so that it will be lifted by advance of the latter. Upon such restoration and consequent recession of the arms I23, I66, it will be obvious that said arms and hence the rock-shaft I65 no longer maintain the cycle-circuit contacts I62 closed. Therefore, even though the cycle contact I3I may still be in contact with its finger I31, there will be but one. cycle of the machine, since a repetition of the cycle would require either immediate selection of another cross-adder or immediate releaseof the lever 3|, either of the latter conditions, however, being avoided by having the register-selecting and subtraction-setting contacts I23 and I30 out of contact with their respective fingers when the cycle contact I3I engages its finger.

To the end that automatict control of crossadder selection, subtraction-setting and cycletripping may be supplemented by manual control, as, for example, when a finger-plate I33 for any zone lacks a certain finger I31, and it is desired in said zone on certain occasions to effect the control which the lacking finger would provide, there may be provided supplemental keys, preferably mounted at one side of the typing-machine keyboard. There may be a key I63 for each cross-adder or register I, 2 or 3 of the computing unit B for selecting said cross-adder manually, a key I10 for cycle-tripping, and a key "I for subtraction-setting. Each of these keys when operated presses a contact I 16 against a conductor-bar I16 common to all the keys and connected to the power-line lead I40. The contacts I15, however, are connected individually to the respective magnets which they are intended to energize upon depression of the corresponding manual key.

Thus, referring to Figure 11, the manual key I63 for selecting cross-adder or register No. 1 has its contact I15'connected by 'a lead I11 to the lead I which goes to the magnet I20 for selecting register No. 1. extends through the normally closed previously described contacts I42, and thence to one side I43 of the power-line, the other side I40 of the power-line being connected to the common conductor I16 so that pressing the contact thereagainst completes the circuit for energizing the magnet for selecting register No. 1. Each of the contacts I15 for the other manual keys is similarly wired for energizing its respective magnet. The latch I25 also serves, like in Figure 8, to maintain the register-selection effected by means of the manual key I63, so that the latter need be depressed only momentarily for enabling the register-selecting magnet I20 to do its work; it being remembered, further, that in a subsequent cycle the general-operator cross-bar 63 engages the arm I12 of said latch I25 to trip the latter for eliminating the register-selection.

In conjunction with the use of any set of the cross-adder wheels 60, it is desirable to print a clear sign to indicate that said set of wheels 60 was properly cleared preparatory to accumulation of amounts therein, or that atotal has been properly transcribed as by a total-subtracting typing operation.

To this end, there is provided in the typing mechanism a type-bar I18 which may be mounted on a segment I13, Figures 1 and 5, which mounts the other type-bars. Said type-bar I18 carries a clear-sign type I and may be pivoted upon a bracket I8I in the same way as said other typebars. For the purpose of the invention, the

.clear-sign type-bar I18 is operated by an electro- I of the typing-mechanism keyboard. Each clearsign key I81 is operable to press a contact I88 against a conductor I83 which spans all the contacts I88. Each key-operated contact I88 is part of a circuit individual to a corresponding set of cross-adder wheels 60, it being contrived to arrange said circuit and combine the same with certain means so that upon pressing the key I81, the clear-sign magnet I82 will only be operated if all the cross-adder wheels 60 in the set stand at zero.

To this end, use may be made of a ball I 30 which spans, as seen in Figure 2, a series of spring-pressed detents I3I, there being one lever for each wheel 60, and the same co-operating with detent-notches I32 presented by each wheel, there being a detent-notch for each digit-position of the wheel. A notch I32 corresponds to the zero-position, and is of greater depth than the notches for the other positions. When all the wheels 60 of a set stand at zero, the bail I30. pressed against all the detents, will be somewhat farther rearward than when any wheel 60 stands at any other position than zero, it being obvious that this condition results from the greater depth of the zero-notches I 32".

From said magnet the circuit The two positions of the bail I30 may therefore 7 be utilized to produce corresponding opening and closing of a pair of contacts I94. One of the contacts I94 may be mounted on a spring I95 which may also serve to press the bail I90 against the detents I9I, it being evident that said one contact will be against or away from the other contact in accordance with the position of said bail I90, saidv other contact being mounted on a relatively stationary plate I98. Each pair of contacts is included in the circuit for the clearsign key I8'I associated with the corresponding set of totalizer-wheels 80.

Referring now to Figure 11, the wheels 80 of cross-adder No. 2 are represented as being all in their zero-positions, and, upon pressing the clear-sign key I8'I for cross-adder No. 2, the clear-sign type-bar I18 will be operated by the magnet I82 because the contacts I94 associated with register No. 2 are closed. The circuit whereby the clear-sign magnet I82 is thus energized includes, for a purpose to be described presently, another magnet I98, and said circuit may be traced-as follows. One side I40 of the power-line is connected to the movable one of the contacts I94, which, closed as seen in Figure 11, connects said power-line side I40 to the magnet I98 by way of a lead I99. From the magnet I98 another lead 200 extends to the contact I88 of the clearsign key I81 for the set of totalizer-wheels associated with the closed contacts I94, so that the closing of said contact I88 upon the common conductor I89 connects the clear-sign magnet I82 by way of a lead 2!. A lead 202 from said magnet I82 goes to the other side I43 of the powerline to complete the circuit. It will be obvious from inspection of Figure 11 that the clear-signprinting circuits for the other sets of totalizerwheels 80 are similar to the one just described.

The clear-sign printing may also be done as a precedent to the start of a new series of indexing and accumulating operations, to assure and indicate not only that the register is initially clear, but also to assure that all the pins are initially in restored or normal condition in order that the first-indexed amount will not be computed erroneously. At the operation of the clearsign key I81 for any of the sets of cross-adder wheels 80, it is desirable therefore to restore any depressed digit-pins 82 associated with such set of wheels. To this end; the clear-sign-printing circuit for each set of cross-adder wheels includes the aforesaid solenoid or magnet I98 to operate the corresponding pin-restoring plate 18. Said plate I8, in order that it may be moved up and down in parallelism, is connected to spaced bellcranks 208, said bell-cranks being pivoted loosely on cross-shafts 204. One of the shafts 204 has plate-raising arms (not shown) and is operable by the general operator substantially as shown in the aforesaid Hart patent, all the plates being raised upon such operation of said one crossshaft 204. The plates I8 may also be individally raised since the bell-cranks 208 are loose on the cross-shafts 204, each pair of bell-cranks being connected by a link 205.

As seen in Figure 6, the link 208 may have a plunger or armature 208 attractable by the pinrestoring magnet I98, it being evident that upon energization of said magnet I98 by operation of the clear-sign key I81, the armature or plunger 208 will be drawn forwardly, the plate I8 being as a result raised and whatever pins 82 were set being restored.

In the illustrated cross-adder unit B, the framework 88 of said unit includes side members which form part of the casing. A forward part 200 of said casing has sight-openings 200 through which the digit-figures on the several sets of cross-adder wheels 80 are visible. The casing may include a top cover 218 secured as shown. The several sets of cross-adder wheels 80 may be mounted between plates 2I2 rising from a front cross-member 2 of the framework. Rising from a rear cross-member 2I8 of the frameworE are side plates 2 in which the denominational cross-shafts I08 may be journaled as indicated in Figure 2. The right-side plate 2 may have studs 2I5 slidably supportingthe latches 88 and I02 associated respectively with the subtraction and cycling magnets 88 and I08.

The single-cycle contacts I82 may be arranged as seen in Figure 2 and mounted on the left-side plate 2; and the rock-shaft I88 which controls said contacts I82 may be journaled in both side plates 2. The circuit-breaking contacts I" associated with the subtraction-magnet 88 and controlled by the lever 9i may be arranged as seen in Figure 2 and mounted upon the rightside plate 2 I4. The circuit-breaking contacts I42 associated with each register-selecting shifterlatch I28 may in the case of the first crossadder to the left be mounted on the left-side plate 2| 4, and in the case of each of the other two cross-adders they may be mounted upon a bracket 2I8 rising from the rear cross-member As seen in Figure 2, the outer arms of the outer bails or shifters II8 may be pivoted on the side plates 2, all other arms of the several shifters II8 being pivoted on the brackets 2 I8 which may be arranged accordingly as indicated in Figure 2. As shown, the cross-bar II8 which supports the rear ends of the stems I I8, I22, may be supported by the plates 2I4; the magnet-supporting plate 89 may be secured to the rear cross-member 2 I8; and the pin-restoring magnets I98 may be supported upon a cross-member 2l9 of the framework.

Referring now to the typing mechanism A, details of the contact block I88 are seen in Figures 3 and 4. Each of the contacts I28 and I80 may be formed as indicated in Figure 3, so as to fit in slots2 20 of a contact block HI and to project above said block as at 222, Figure 3, for the attachment of wires such as I leading thereto. The power-line contact I88 is similarly fitted in the contact block Hi. The cycle contact I8I may also fit in a slot of the contact block and may project through the upper part of the contact block MI in the form of a threaded stem 223, Figure 1, for attachment to the latter of the lead-wire I88.

The denomination-contacts I82 may be plates formed as indicated in Figure 5 and fitted in a slotted bar 228 of insulating material, the slots facing the front of the contact block 22I, as indicated in Figures 4 and 5, each contact I82 projecting above the top of said bar for the attachment of the wire I48 leading to appropriate denomination-magnet III. The contact block 221, the bar 228 and the several contacts I28 to I88 may be clamped together by screws 221, each surrounded by an insulated bushing 228. The contact surfaces of the contacts I29, I80, Ill and I88 are to be made of appropriate length as indicated for example at I28 for a contact I28, the contact surfaces being defined as by jogging the contacts as at I29", Figure 3.

All the wires that lead from the contacts in the contact block I88 are included in the cable I21 which operatively connects the typing mechanism A and the auxiliary unit B. Said cable also includes other wires extending from the mechanism A to the unit B, such as the wire 233 from each clear-sign-key contact I33, the wires I53 from the digit-selecting contacts I and all other wires indicated in Figure 11 as extending between the typing mechanism A and cross-adder unit B. One end of the cable I21 is secured, as indicated in Figure 1, to the contact block I33 and extends horizontally from the contact block to drop downwardly from a point at the side of said frame I9, the latter having a sheave 233 over which the cable drops and over which it runs as the typing mechanism travels crosswise.

The tabulating counterstops 33 and the arrangement thereof for locating of the same upon the stop-locating cross-bar 51 may be similar to the stops shown in the aforesaid Foothorap Patent No. 1,280,697. The finger-plate I39 which is to be operated in a zone corresponding to a counterstop 53 may be fastened upon the top of the latter, but insulated from the stop, the body of which may be extended as at 229, Figure l, for attachment of the plate I39 and insulation piece I33 as indicated. It will be observed, see Figure 1, that there may be a plurality of such fingerplates I39, each finger-plate I39 serving a different computing zone and presenting an array of fingers I31 arranged according to the computive operations to be effected in the zone.

Referring to the key-operated denominationcircuit contacts I43, Figures 1 and 5, and also referring to the diagram at Figure 11, it will be noted that the like contacts of the several pairs are connected together. Thus, as indicated in Figure 1, all the forward ones of the contacts I43 are members of a crosswise extending bar I 43' and similarly the rear ones of said contacts are members of a crosswise extending bar I43", said bars being insulated one from the other by an insulator 23I and being mounted as indicated in Figures 1 and 5 upon a comb-plate 232 for the key-levers.

The digit-selecting contacts I43 are mounted upon a bar 233 supported by and insulated from the frame 22 as indicated in Figure 1. Projecting from said bar 233 are the lowerones of the contacts I43, said lower contacts having a common connection through the bar 233. The upper ones of the contacts I43 rest upon insulation 234 which insulates the upper contacts I43 individually and from the bar 233. Wires I33 leading from upper contacts I43 are attached to the latter b" screws 235 which may also serve to clamp together said upper contacts, the underlying insulation 234, the bar 233 and a plate 233 from which the lower contacts project.

The arrangement of the manually-operable contact mechanism which includes the keys I39- I13 at the left of the typing-mechanism keyboard is similar to the mechanism for the clear-sign keys I31 and therefore only the latter will be described. A casing 231 is attached to the side of the typing-mechanism frame 22 and is perforated at its top to receive push-buttons which constitute the clear-sign keys I31 as seen in Figure 5. Each push-button or key I31. has at its bottom a flange I31 which is pressed against the under side of the casing 231 by a contact spring which constitutes the movable contact I33, said contact spring being insulated from the casing 231 as indicated in Figure 5, the key I31 being preferably of insulating material. The common contact I33 associated with the clear-sign contacts I33 may be supported by and between the side walls of the casing 231 and may be insulated therefrom by insulators 233, Figures 1 and 5.

Details of the conjoint operation of the typing mechanism A and the cross-adder unit B will be understood from the preceding description and said operation may therefore be summarized as follows.

For any or each computing zone traversed by operation of the typing mechanism A and in which the cross-adder unit B comes into play, there is provided an array of fingers I31.-. Figure 1 indicates four such arrays of fingers for four zones in each of which there may also be used a vertical totalizer I3 of the typing mechanism A. It will be obvious that there may be a zone in which only a vertical totalizer such as I3 Figure 1, is employed, in which case the array of.

fingers I31 will be omitted from such zone. Con versely, it will be obvious that there may be zones in which only the auxiliary unit B comes into play.

In letter-feeding or in tabulating from zone to zone the frame 22 moves rightward. In any computing zone the typing mechanism is first positioned to the denomination of the first figure of the amount to be written in said zone, said positioning taking place as by operation of the proper tabulating key 33.

Such positioning of the frame 22 will have also positioned its contact block I33, so that the proper denomination-contact I32 in said block is in contact with its finger I31. Those contacts I29 in said block which correspond to the circuits for the sets of cross-adders which are to be employed in'the zone, and for which fingers I31 are provided, will also have made contact with their fingers and the power-line contact I33 will be in contact with its finger.

The fingered contacts I29 will therefore function to energize the proper cross-adder-selecting magnets I23, and cause the corresponding shifters or selectors II3 to be raised and latched, the circuits for the operated magnets I 23 being there upon broken by means of the contacts I42. This raising of the shifters II3 brings their respective sets of couplers I I1 into operative alignment with the drivers 3| for the selected sets of cross-adder wheels as indicated in Figure 8.

The amount may now be typed figure by figure and, if desired, entered in a vertical totalizer I3 of the typing mechanism A. Simultaneously with the typing thereof, said amount may also be entered for the selected sets of cross-adder wheels 33 in unit B, the amount, however, not being directly entered into the selected wheels 33, but

being indexed in the drivers 3|, which in each selected group are advanced to bring their pins 32 to indexing position under the digit-members 34 of unit B, one driver after the other in proper denominational order, as the typing mechanism moves rightward in the letter-feeding steps.

At each letter-feeding step or denomination, the proper denominational contact I32 makes contact with its finger I31, but such contact alone does not energize the corresponding denomination-magnet III. Said magnet III is energized at the beginning of the down stroke of a numeralkey lever 23 by the closing of the, contacts I43, whereupon the proper driver 3I in each selected group is advanced to pin-setting position, as indicated in Figure 9, in which it is further shown that the numeral-key lever 23 has completed its down stroke, so that, at the bottom of the keylever stroke, the digit-selecting contacts I43 are closed to energize the corresponding digit-selecting magnet 80, and thereby depress the digitmember 64 to set the proper pin 62in the advanced driver SI of each selected group of drivers. Upon release of the numeral-key lever 26, the contacts I48 are opened, the depressed digitmember 64 being thereby restored, and the denomination-circuit contacts 8 are also opened. The typing mechanism upon said release of the numeral-key takes a letter-feeding step to the next denominatiomany drivers 6i previously advanced to pin-setting position being retracted to their Figure 6 position by the usual spring 240, the driver or drivers 6| for said next denomination not being advanced, however, until the next keylever 26 is operated.

Thus the typing of an amount, figure by figure, the direct entry of each figure into the vertical totalizer iii, if desired, and the corresponding indexing of each figure in the selected groups of cross-adder drivers 6| proceed to the last figure of the amount.

Following the typing of the last figure the typing mechanism takes its usual letter-feeding step, causing the contacts I29 and I32 to pass beyond their respective fingers I31.

If automatic cycle-tripping is practiced for the zone, the cycle-tripping contact i3l, as a result oi said last letter-feeding step, engages its finger I31, which will have been provided in the plate I39. The cycling magnet Hi3 is thereby ener gized to release the cycle-trip lever IOI, Figure 6, and thereby raise the clutch-pin 98. This initiates a cycle in which the general operator 63 advances the indexed drivers 6! to drive the selected cross-adder wheels 60, and then returns to return the indexed drivers. The drivers have the usual one-way connection to the totalizerwheels 60, so as to drive the latter in only one direction of the driver movement.

It will be understood that suitable carry-over mechanism (not specifically shown) is associated with the operation of the cross-adder wheels ill.

Upon the cycling of the general operator, the raised shifters H8 are unlatched and restored, and other parts associated with said shifters are also restored, such as the contacts 2 and I62. The set digit-pins 62 will also have been restored by the cycling of the general operator 63, the pinrestoration being effected by operation of the plates 18 through the medium of the general operator.

Instead of cycle-tripping being eifected automatically, upon the typing mechanism taking the letter-feeding step following the typing of the last digit, the cycle-key. I10 may be operated, in which case the finger I31 for the cycle-contact i3i may be omitted.

It will be obvious that if the computation in the selected totalizer-wheels 60 is to be subtractive, the array of fingers I31 will include one to be engaged by the subtraction-contact I30. In such case upon the entry of the typing mechanism in a computing zone, the subtraction-magnet 88 will be energized to release the lever and thereby release the subtraction-setter 69,'

which conditions, aspreviously explained, the indexing mechanism for complementary subtractive indexing. In the general-operator cycle following the subtractive indexing, the lever 9| is restored by the general operator 63 in its forward stroke, the return stroke restoring the sub traction-setter 69, which, by reason or the restored lever 94, becomes latched again by the latch 12. Restoration of the subtraction-setter restores the indexing mechanism 64, I, I6 and related parts to additive condition.

It will be evident that more sets of cross-adders or wheels 80 and related parts may be provided than the three sets illustrated in the drawings, or there may be less than three sets. For each additional set there is provided in the contact block I" a cross-adder set-selecting contact "9.

Variations may be resorted to within the scope of the invention, and portions of the -.improvements may be used without others.

Having thus described my invention, I claim:

1. In combination, a typewriter, a computing mechanism including a set of computing wheels, said computing mechanism also including a device controlled by said computing wheels to represent whether or not all of said wheels are clear, a clear-sign printing type in said typewriter, an electromagnet for actuating said clear-sign printing type, a clear-sign type-key, and an operating circuit for said electromagnet controlled in part by said clear-sign type-key and in part by said device whereby said key is eiiective toenergize said magnet to actuate said .clear-sign type only when said wheels are clear.

2. The invention defined in claim 1, said computing mechanism including settable index elements, and a restored operable to restore said index elements, and an electromagnet, for actuating said restorer, connected in said circuit to be energized concomitantly with operation of said clear-sign key only when all of said computingwheels are clear.

3. In combination, a typewriter including digit type-keys, and a carriage controlled thereby, a computing mechanism having digit indexing and denomination-selecting means co-operative with said type-keys and carriage at a computing zone 01 the latter, said computing mechanism including a trippable cycling mechanism, an electromagnet for tripping said cycling mechanism, means, responsive to the carriage only when the latter is in a computing zone, to become set and thereby partly close an operating circuit for said magnet, a contact device closable by the carriage, as the latter leaves said computing zone, to complete said circuit and thereby trip said cycling mechanism, and a device co-operating with said cycling mechanism to restore said set means to reopen said circuit, whereby to prevent repetition of the cycle even though said carriage may still be in position to close said contact device.

4. In a machine or the class described, the combination of a reciprocatory carriage, a set of register bars,- denominational devices operable seriatim by the carriage for selecting the register bars for indexing, said devices and register bars normally being operatively disconnected, means shiitable from a normal inoperative position to operative position to effect operative connection of said denominational devices and register bars, an electromagnet actuatable for shifting said shlftable means to operative position, a circuit adapted to be closed bysaid carriage to actuate said magnet, and a latch automatically operative to hold said shiftable means in operative position a following the actuation of said magnet.

5. In a machine of the class described, the combination of a reclprocatory carriage, a set or register bars, denominational devices operable seriatim by the carriage for selecting the register bars for indexing, said devices and register bars normally being operatively disconnected, means shiitable from a normal inoperative position to operative position to eilect operative connection oi'said denominationaldsvioesandregisterbars. actiilfiable an electromagnet I ior shitting said shiitable means to operative position. a circuit adaptedtobeclosedbysaidcarriagetoactuate said magnet, a latch automatically operative to,

hold said shiitable means in operative position following the actuation oi said magnet, and a contact device in said circuit and controlled by said latch-to break said circuit in response to said latch becoming elective to hold said shiftable means.

6. In a machine of the class described. the combination of a carriage, a set oi register bars, denominational devices operable seriatimbythecarriageicrselectingtheregister 11 barsior indeainmsaiddevices andregisterbars normally. being operatively disconnected, means shiitabie from a normal inoperative position to operative position to eilect operative connection oi said denominational de'vices and register bars, an electromagnet actuatable for shitting said shiitabie means to operative position, a circuit adapted to be closed by said carriage to actuate said magnet, a latch automatically operative to hold said shii'table means in operative position ioliowing the actuation -01 said magnet, and a general operator mechanism operable to trip said latch preparatory to restoration of said shiitable means to inoperative position. I JOHN TOGGENBURGIR. 

